Been ttc but no luck

Andreea
Been trying to get pregnant for about 3months now but no luck. Tbh i dont have a regulare cyrcle and i was trying to figure out when i ovulate. My last period started on the 30th of august 2015 and ended on the 4th of September. Since than me and my partner had sex every 2days. I suppose to be ovulating on the 12th but im using digital clearblue ovulation kit and i didnt got a smile face. Been testing every morning but no smile face yet. Does any1 has the same problem as me? Pls help